YANG Yan,ZHANG Hao-wen,ZHANG Jin-long.Single image dehazing combining sky segmentation and transmission mapping[J].Optics and Precision Engineering,2021,29(02):400-410.
To solve the contour effect and color distortion problems in the sky area of the dark channel prior algorithm, a dehazing algorithm for sky area segmentation and transmission mapping of different areas is proposed. First, the sky area of an image is roughly segmented using the adaptive threshold method, and the atmospheric light value is estimated in the sky area. Second, the dark channel is improved by applying the super-pixel segmentation method to obtain the initial transmission, and refined transmission is obtained using the guided filtering method. Adaptive threshold segmentation is performed on the refined transmission, and the largest connected domain is retained to achieve fine segmentation of the sky area. Finally, different transmission mapping methods are proposed for the sky and non-sky areas to obtain the final transmission, and the atmospheric scattering model is used to restore the image. Experimental results showed that the restored image performed well in terms of both subjective vision and objective indicators. This effectively solves the defect whereby the dark channel prior algorithm easily fails in the sky area. The proposed dehazing algorithm can restore a more natural sky and weaken the halo effect in the edge area.
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